MAX9792 MAXIM [Maxim Integrated Products], MAX9792 Datasheet

MAX9792

Manufacturer Part Number

MAX9792

Description

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX9792.pdf (30 pages)

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The MAX9791 combines a stereo 2W Class D power

amplifier, a stereo 180mW DirectDrive

amplifier, and a 120mA low-dropout (LDO) linear regu-

lator in a single device. The MAX9792 combines a

mono 3W Class D power amplifier, a stereo 180mW

DirectDrive headphone amplifier, and a 120mA LDO

linear regulator in a single device.

The MAX9791/MAX9792 feature Maxim’s patented**

DirectDrive headphone amplifier architecture that pro-

duces a ground-referenced output from a single supply,

eliminating the need for large DC-blocking capacitors,

saving cost, board space, and component height. High

107dB DC PSRR and low 0.006% THD+N ensure clean,

low-distortion amplification of the audio signal.

The ground sense feature senses and corrects for the

voltage difference between the output jack ground and

device signal ground. This feature minimizes head-

phone amplifier crosstalk by sensing the impedance in

the ground return trace and correcting for it at the out-

put jack. This feature also minimizes ground-loop noise

when the output socket is used as a line out connection

to other grounded equipment (for example, a PC con-

nected to a home hi-fi system).

The MAX9791/MAX9792 feature low RF susceptibility,

allowing the amplifiers to successfully operate in close

proximity to wireless applications. The MAX9791/

MAX9792 Class D amplifiers feature Maxim’s patented

spread-spectrum modulation and patented

emissions limiting circuitry. Industry-leading click-and-

pop suppression eliminates audible transients during

power-up and shutdown cycles.

The MAX9791/MAX9792 wake-on-beep feature wakes

up the speaker and headphone amplifiers when a qual-

ified beep signal is detected at the BEEP input.

For maximum flexibility, separate speaker and head-

phone amplifier control inputs provide independent

shutdown of the speaker and headphone amplifiers.

Additionally the LDO can be enabled independently of

the audio amplifiers.

The MAX9791/MAX9792 feature thermal-overload and

output short-circuit protection. The devices are avail-

able in 28-pin TQFN packages and are specified over

the -40°C to +85°C extended temperature range.

19-4217; Rev 0; 11/08

Windows Vista is a registered trademark of Microsoft Corp.

** U.S. Patent #7,061,327.

†

††

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Amplifiers with DirectDrive Headphone Amplifiers

U.S. Patent #6,847,257.

U.S. Patent #7,190,225.

Notebook Computers

Tablet PCs

Portable Multimedia Players

Windows Vista-Compliant Class D Speaker

________________________________________________________________ Maxim Integrated Products

General Description

Applications

headphone

††

active

†

♦ Windows Vista® Premium Compliant

♦ Low EMI Filterless Class D Speaker Amplifiers

♦ 180mW DirectDrive Headphone Amplifier

♦ Excellent RF Immunity

♦ Integrated 120mA LDO

♦ Eliminates Headphone Ground Loop Noise

♦ Wake-on-Beep Function

♦ Click-and-Pop Suppression

♦ Short-Circuit and Thermal-Overload Protection

♦ Thermally Efficient, Space-Saving Package

Note: All devices are specified over the -40°C to +85°C

extended temperature range.

+ Denotes a lead-free/RoHS-compliant package.

* EP = Exposed pad.

DirectDrive is a registered trademark of Maxim Integrated

Products, Inc.

MAX9791AETI+

MAX9791BETI+

MAX9792AETI+

Simplified Block Diagrams continued at end of data sheet.

Pass EN55022B Emissions Limit with 30cm of

Speaker Cable

28-Pin TQFN-EP (4mm x 4mm x 0.75mm)

4.5V TO 5.5V

PART

Simplified Block Diagrams

MAX9791A

MAX9791B

SPEAKER SUPPLY

SPKR_EN

4.5V TO 5.5V

HP_EN

LDO_EN

BEEP

STEREO/

MONO

Stereo

Mono

Ordering Information

HEADPHONE SUPPLY

LDO

2.7V TO 5.5V

CLASS D

AMP

OUTPUT

4.75V

LDO

3.3V

3.3V OR 4.75V

PIN-PACKAGE

28 TQFN-EP*

Features

Related parts for MAX9792

MAX9792 Summary of contents

Page 1

... The MAX9791 combines a stereo 2W Class D power amplifier, a stereo 180mW DirectDrive amplifier, and a 120mA low-dropout (LDO) linear regu- lator in a single device. The MAX9792 combines a mono 3W Class D power amplifier, a stereo 180mW DirectDrive headphone amplifier, and a 120mA LDO linear regulator in a single device. ...

Page 2

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ABSOLUTE MAXIMUM RATINGS Supply Voltage (AVDD, PVDD, HPVDD to GND)........................-0.3V to +6.0V GND to PGND, CPGND ......................................................±0.3V CPVSS, C1N to GND ............................................-6. 0.3V HPL, HPR to CPVSS ...........................................-0.3V ...

Page 3

... L (MAX9792) P OUT R = 4Ω L (MAX9791) THD 1kHz 8Ω +25°C (MAX9791) A (Note 3Ω L (MAX9792 8Ω 500mW 1kHz (Note 4) L OUT R = 4Ω 500mW 1kHz (Note 4) L OUT 4.5V to 5.5V, T AVDD PVDD f = 217Hz, 200mV P-P PSRR f = 1kHz, 200mV P 10kHz, 200mV ...

Page 4

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued 5V, V AVDD PVDD HPVDD GND wise specified 20kΩ 12dB), R IN1 VSPKR unless otherwise noted. Typical ...

Page 5

Page 6

... R = 3Ω -3dBFS IN -20 -30 - -50 RMS -60 -70 - 707mV RMS -90 -100 0.01 0 100 FREQUENCY (kHz) TOTAL HARMONIC DISTORTION + NOISE vs. OUTPUT POWER (MAX9792 SPEAKER MODE) 100 R = 3Ω 6kHz 1kHz 0.1 0. 100Hz 0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 OUTPUT POWER (W) 6 _______________________________________________________________________________________ = ...

Page 7

... LEFT -50 -60 -70 -80 RIGHT -90 -100 0.1 10 0.01 1 FREQUENCY (kHz) = ∞, unless oth 1µ 1µF. R LDO L = 470nF 1µF, measurement BW IN1 IN2 COM EFFICIENCY vs. OUTPUT POWER (MAX9792 SPEAKER MODE) 110 100 R = 8Ω 100 0 0.5 1.0 1 ...

Page 8

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

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Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers PIN NAME 1 SPKR_INL Left-Channel Speaker Amplifier Input 2 HP_INR Right-Channel Headphone Amplifier Input 3 HP_INL Left-Channel Headphone Amplifier Input 4 COM Common-Mode Voltage Sense Input 5 GND Signal Ground. ...

Page 17

... The MAX9791 combines a stereo 2W Class D power amplifier, a stereo 175mW DirectDrive headphone amplifier, and a 120mA LDO linear regulator in a single device. The MAX9792 combines a mono 3W Class D power amplifier, a stereo 175mW DirectDrive head- phone amplifier, and a 120mA LDO linear regulator in a single device. ...

Page 18

... Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers Table 1. Windows Premium Mobile Vista Specifications vs. MAX9791/MAX9792 Specifications DEVICE TYPE REQUIREMENT THD+N Analog Line-Out Jack Dynamic range with signal (R = 10kΩ present 0.707V ) RMS Line output crosstalk THD+N Dynamic range with signal ...

Page 19

... Maxim’s patented DirectDrive architecture uses a charge pump to create an internal negative supply volt- age. This allows the headphone outputs of the MAX9791/MAX9792 to be biased at GND while operat- ing from a single supply (Figure 3). Without a DC com- ponent, there is no need for the large DC-blocking capacitors. Instead of two large (220µ ...

Page 20

... However often necessary to locate some jacks far from the audio device. The MAX9791/MAX9792 COM and SENSE inputs allow the headphone jack to be placed further away from the device without degrading crosstalk performance. ...

Page 21

... SPKR AND HP AMPS ENABLE Figure 7. Qualified BEEP Signal Timing ______________________________________________________________________________________ Figure 6. MAX9791/MAX9792 COM and SENSE Inputs Reduce Crosstalk time, connect SPKR_EN and HP_EN together, allowing a single logic voltage to enable either the speaker or the headphone amplifier as shown in Figure 8. The MAX9791/MAX9792 feature a low-power shutdown mode, drawing 0.1µ ...

Page 22

... Figure 8. Enabling Either the Speaker or Headphone Amplifier with a Single Control Pin Click-and-Pop Suppression The MAX9791/MAX9792 feature a common-mode bias voltage of 0V BIAS allows the MAX9791/MAX9792 to quickly turn on/off with no resulting clicks and pops. With the HDA CODEC outputs biased and the MAX9791/MAX9792 inputs sitting shutdown ...

Page 23

... Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers Setting Speaker Amplifier Gain External input resistors in conjunction with the internal feedback resistors (R ) set the speaker amplifier FSPKR gain of the MAX9791/MAX9792. Set gain by using resistor R as follows (Figure 9): IN1 ⎛ ⎞ Ω ...

Page 24

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers INPUT COUPLING CAPACITOR-INDUCED THD+N vs. FREQUENCY (HEADPHONE MODE) -50 0603 10V X7R 10% 1μF -60 -70 0603 10V X5R 10% 1μF -80 0805 50V X7R 10% 1μF -90 0402 6.3V ...

Page 25

... Large output, supply, and GND traces also improve the power dissi- pation of the device. The MAX9791/MAX9792 thin QFN package features an exposed thermal pad on its underside. This pad lowers the package’s thermal resistance by providing a direct heat conduction path from the die to the printed circuit board ...

Page 26

... CPGND C1N CPVSS 11 SENSE 25 MAX9792A 26 10 HPL *EP HPR LDO_EN TQFN (4mm x 4mm x 0.75mm) *EP = EXPOSED PAD Simplified Block Diagrams (continued) SPEAKER SUPPLY HEADPHONE SUPPLY 4.5V TO 5.5V 2.7V TO 5.5V CLASS D AMP MAX9792A SPKR_EN HP_EN LDO_EN BEEP 4.75V LDO ...

Page 27

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers C IN3 R IN3 C RIN1 IN1 SPKR_INL CIN1 RIN1 SPKR_INR C R IN3 IN3 C IN2 R IN2 HP_INL 3 C IN2 R IN2 HP_INR 2 4.5V TO 5.5V ...

Page 28

... SPKR_EN = 0, SPEAKER AMPLIFIER ENABLED HP_EN = 1, HEADPHONE AMPLIFIER ENABLED 28 ______________________________________________________________________________________ 4.5V TO 5.5V PVDD 17, 26 20kΩ MONO 28 CLASS D AMPLIFIER CONTROL 4 40.2kΩ LDO BLOCK 1, 5 20, 23 GND PGND MAX9792A Block Diagram 0.1μF MAX9792A MAX9792B 19, 24 OUT+ 18, 25 OUT- 40.2kΩ TO HPVDD 10 HPL TO CPVSS 9 HPR TO HPVDD 2.7V TO 5.5V 40.2kΩ 11 SENSE ...

Page 29

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 28 TQFN-EP ______________________________________________________________________________________ Package Information PACKAGE CODE T2844-1 DOCUMENT NO. 21-0139 29 ...

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Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers For the latest package outline information and land patterns www.maxim-ic.com/packages. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. ...

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